#include  <stdio.h>
int main()
{
	int i = 0;
	int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
	int sz = sizeof(arr) / sizeof(arr[0]);
	int left = 0;
	int right = sz - 1;
	while (left <= right)
	{
                int mid = left + (right - left)/2;
		if (arr[mid] < 7)
		{
			left = mid + 1;
		}
		else if (arr[mid]>7)
		{
			right = mid - 1;
		}
		else
		{
			printf("找到了，下标是%d\n", mid);
			break;
		}
	}
	if (left > right)
	{
		printf("没找到！！！");
	}
	return 0;
}
